public void DrawOneSide(Samples samples, Graphics gr, Rectangle bounds, bool normalize = false) { var kx = bounds.Width / samples.Values.Length; var ky = bounds.Height; var cy = bounds.Bottom; var cx = bounds.Left; var values = samples.Values; if (normalize) { var s = samples.Clone(); s.Normalize(); values = s.Values; } using (var pen = new Pen(ForeColor)) for (int i = 0; i < values.Length; i++) { var x = i * kx; var y = values[i]; if (y > 1) y = 1; if (y < -1) continue; y = y * ky; gr.DrawLine(pen, cx + x, cy, cx + x, cy - y); } }
public Samples Clone() { var result = new Samples(); result.Bitrate = Bitrate; result.Values = new float[Values.Length]; Array.Copy(Values, result.Values, Values.Length); return result; }
public void Process(Audio item, AudioInfo info) { var tempogram = new Tempogram(); var s = info.Samples; s = new EnvelopeProcessor(factory).Build(info.Samples, 32, false); var s2 = new Samples() { Values = new float[s.Values.Length], Bitrate = s.Bitrate }; var intensity = 0; for (int i = 0; i < s.Values.Length - 1; i++) { var d = s.Values[i + 1] - s.Values[i]; var dd = d > 0 ? d : 0; s.Values[i] = dd; s2.Values[i] = d; if (d > minAmplitudeChangeForIntensityRate) intensity++; } s.Values[s.Values.Length - 1] = 0; s2.Values[s.Values.Length - 1] = 0; var time = s.Values.Length / s.Bitrate;//time of sound var maxShift = (int)(s.Values.Length * (maxRithmDuration / time)); var autoCorr1 = AutoCorr(s.Values, maxShift, 5); var autoCorr2 = AutoCorr(s2.Values, maxShift, 2); var l = (float)autoCorr1.Length; var k = Math.Log(2); var list1 = new List<KeyValuePair<float, float>>(); var list2 = new List<KeyValuePair<float, float>>(); for (int i = 0; i < l; i++) { var j = i / (float)l; j = (float)(Math.Log(j + 1) / k); list1.Add(new KeyValuePair<float, float>(j, autoCorr1[i])); var v = autoCorr2[i]; list2.Add(new KeyValuePair<float, float>(j, v > 0 ? v : 0)); } tempogram.LongTempogram.Build(list1); tempogram.ShortTempogram.Build(list2); tempogram.Intensity = (float)intensity / time; CalcTempo(tempogram); //save to audio item item.Data.Add(tempogram); }
/// <summary> /// Amplitude envelope builder /// </summary> public Samples Build(Samples source, int targetBitrate = 20, bool differentiate = false) { float k = 1f * targetBitrate /source.Bitrate; var values = source.Values; var resValues = new float[(int)(values.Length * k)+1]; for (int i = values.Length - 2; i >= 0; i--) { var ii = (int) (i*k); var prev = resValues[ii]; var f = values[i]; if (differentiate) f = values[i + 1] - f; if(f < 0) f = -f; if (prev < f) resValues[ii] = f; } return new Samples() { Bitrate = targetBitrate, Values = resValues }; }